Light Emitting Device Brightness via Auxiliary Particles
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Solution Overview
Problem
Conventional light emitting devices for display devices suffer from low light efficiency and short lifespan due to the wastage of emitted light in non-viewing directions and the adverse effects of high voltage operation.
Innovation Solution
Incorporation of auxiliary light emitting particles with diameters smaller than the wavelength of visible light, distributed within the light emitting layer, and a refractive index lower auxiliary layer to redirect and reuse light, enhancing brightness and extending lifespan without the need for high voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high voltage is applied to improve brightness, then brightness increases, but life span is shortened
Solution Approach 1:
The patent changes the optical parameters of the light emitting layer by incorporating auxiliary light emitting particles with specific size ranges (smaller than the wavelength of emitted light) and controlled concentrations (1-50 wt%). This modifies the light extraction efficiency and directional distribution, enabling higher brightness at lower operating voltages, thus extending device life span while maintaining illumination intensity.
2Illumination intensity
If light is emitted in all directions, then light coverage is maximized, but light efficiency for display is reduced to 25%
Solution Approach 1:
The patent applies local quality modification by introducing auxiliary light emitting particles with specific optical properties into the light emitting layer. These particles have sizes smaller than the wavelength of emitted light, creating localized scattering centers that redirect light preferentially toward the viewing direction (front direction) while maintaining overall light emission. This selective directional enhancement improves light efficiency without completely suppressing emission in other directions.
Solution Approach 2:
The patent converts the harmful effect of light emission in non-viewing directions (which was previously wasted energy) into a beneficial effect. By incorporating auxiliary light emitting particles, the light emitted in non-viewing directions is scattered and redirected toward the front direction, transforming what was previously 75% wasted light into useful illumination. This converts the harm of omnidirectional emission into the benefit of enhanced front-direction brightness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Significantly increases brightness by up to 1.9 times in the viewing direction while maintaining a longer lifespan by effectively redirecting and reusing emitted light, improving the overall performance of light emitting devices and display devices.
Implementation Method 1
auxiliary light emitting particles that convert a path of the light
Implementation Method 2
an auxiliary layer having a refractive index lower than that of the substrate and being formed at a bottom surface of the substrate. The auxiliary layer serves to convert the path of the light, which has been output from the substrate, toward the substrate.
Data Source
AI summary
Disclosed are a light emitting device and a display device using the same. The light emitting device includes a first electrode formed on a top surface of a substrate and a second electrode formed on a top surface of the light emitting layer. The light emitting layer auxiliary light emitting particles that convert the path of light, so that brightness of the light emitting device and the display device is improved.